I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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Exch-2-710
Group -
Receive Connector timeout must be limited.
Email system availability depends in part on best practices strategies for setting tuning. This configuration controls the number of idle minutes before the connection is dropped. It works in c...Rule Low Severity -
Exch-2-715
Group -
Internal Receive Connectors must not allow anonymous connections.
This control is used to limit the servers that may use this server as a relay. If a Simple Mail Transport Protocol (SMTP) sender does not have a direct connection to the Internet (for example, an ...Rule Medium Severity -
Exch-2-718
Group -
Internal Receive Connectors must require encryption.
The Simple Mail Transfer Protocol (SMTP) Receive Connector is used by Exchange to send and receive messages from server to server using SMTP protocol. This setting controls the encryption strength...Rule Medium Severity -
Exch-2-727
Group -
Receive Connectors must control the number of recipients per message.
Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the maximum number of recipients who will receive a copy of a...Rule Low Severity -
Exch-2-733
Group -
Receive Connectors must be clearly named.
For receive connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be ma...Rule Low Severity -
Exch-2-736
Group -
Auto-forwarding email to remote domains must be disabled or restricted.
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure Aut...Rule Medium Severity -
Exch-2-741
Group -
Receive Connector Maximum Hop Count must be 60.
Email system availability depends in part on best practices strategies for setting tuning configurations. This setting controls the maximum number of hops (email servers traversed) a message may ta...Rule Low Severity -
Exch-2-751
Group -
Send Connectors must be clearly named.
For send connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be made ...Rule Low Severity -
Exch-2-754
Group -
Send Connectors delivery retries must be controlled.
This setting controls the rate at which delivery attempts from the home domain are retried, user notifications are issued, and notes the expiration time when the message will be discarded. If de...Rule Low Severity -
Exch-2-757
Group -
Message size restrictions must be controlled on Send connectors.
Email system availability depends in part on best practices strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound...Rule Low Severity -
Exch-2-760
Group -
Send Connector connections count must be limited.
This setting controls the maximum number of simultaneous outbound connections allowed for a given SMTP Connector, and can be used to throttle the SMTP service if resource constraints warrant it. I...Rule Low Severity -
Exch-2-763
Group -
Internal Send Connectors must use Domain Security (Mutual Authentication TLS).
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. There are several controls that work together to provide security between ...Rule Medium Severity -
Exch-2-766
Group -
Internal Send Connectors must require encryption.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. There are several controls that work together to provide security between ...Rule Medium Severity -
Exch-2-771
Group -
Internet facing send Connectors must specify a Smart Host.
In the case of identifying a 'Smart Host' for the email environment, a logical send connector is the preferred method. A 'Smart Host' acts as an Internet Facing Concentrator for other email serve...Rule Medium Severity -
Exch-2-801
Group -
Connectivity logging must be enabled.
A connectivity log is a record of the SMTP connection activity of the outbound message delivery queues to the destination Mailbox server, smart host, or domain. Connectivity logging is available on...Rule Medium Severity -
Exch-2-805
Group -
Exchange must not send delivery reports to remote domains.
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure tha...Rule Medium Severity -
Exch-2-808
Group -
Exchange must not send non-delivery reports to remote domains.
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure tha...Rule Medium Severity -
Exch-2-811
Group -
External/Internet bound automated response messages must be disabled.
SPAM originators, in an effort to refine mailing lists, sometimes use a technique where they monitor transmissions for automated bounce back messages, such as 'Out of Office' messages. Automated m...Rule Medium Severity -
Exch-2-814
Group -
Exchange must not send auto replies to remote domains.
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Remote use...Rule Medium Severity -
Exch-2-817
Group -
Email Diagnostic log level must be set to low or lowest level.
Log files help establish a history of activities, and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Diagnostic logging, however, characterist...Rule Medium Severity -
Exch-2-820
Group -
The Send Fatal Errors to Microsoft must be disabled.
Log files help establish a history of activities, and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. This setting enables an automated log e...Rule Medium Severity -
Exch-2-823
Group -
Administrator audit logging must be enabled.
Unauthorized or malicious data changes can compromise the integrity and usefulness of the data. Automated attacks or malicious users with elevated privileges have the ability to affect change usi...Rule Medium Severity -
Exch-2-826
Group -
Audit data must be protected against unauthorized access.
Log files help establish a history of activities, and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be consid...Rule Medium Severity -
Exch-2-828
Group -
Exchange application directory must be protected from unauthorized access.
Default product installations may provide more generous access permissions than are necessary to run the application. By examining and tailoring access permissions to more closely provide the leas...Rule Medium Severity -
Exch-2-831
Group -
Exchange must not send Customer Experience reports to Microsoft.
Log files help establish a history of activities, and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. This setting enables an automated entry t...Rule Medium Severity
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